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        $x = "Housecat catenates house and cat";
        $x =~ /cat/;    # matches cat in 'housecat'
        $x =~ /\bcat/;  # matches cat in 'catenates'
        $x =~ /cat\b/;  # matches cat in 'housecat'
        $x =~ /\bcat\b/;  # matches 'cat' at end of string